1213625236 has 12 divisors (see below), whose sum is σ = 2132961012. Its totient is φ = 604207808.

The previous prime is 1213625233. The next prime is 1213625243. The reversal of 1213625236 is 6325263121.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 101002500 + 1112622736 = 10050^2 + 33356^2 .

It is a junction number, because it is equal to n+sod(n) for n = 1213625198 and 1213625207.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1213625233) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 650155 + ... + 652018.

It is an arithmetic number, because the mean of its divisors is an integer number (177746751).

Almost surely, 2^1213625236 is an apocalyptic number.

It is an amenable number.

1213625236 is a deficient number, since it is larger than the sum of its proper divisors (919335776).

1213625236 is a wasteful number, since it uses less digits than its factorization.

1213625236 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1302410 (or 1302408 counting only the distinct ones).

The product of its digits is 12960, while the sum is 31.

The square root of 1213625236 is about 34837.1243933824. The cubic root of 1213625236 is about 1066.6653794689.

Adding to 1213625236 its reverse (6325263121), we get a palindrome (7538888357).

The spelling of 1213625236 in words is "one billion, two hundred thirteen million, six hundred twenty-five thousand, two hundred thirty-six".